THE BIOLOGY OF 

 THE SEASONS 



BY 



J. ARTHUR THOMSON, M.A. 



Regius Professor of Natural History in the University of Aberdeen 



AUTHOR OF 



"THE WONDBR OF LIFE," "DARWINISM AND HUMAN LIFE," "HEREDITY," 



"THE STUDY OF ANIMAL LIFE," "HERBERT SPENCER," "THE SCIENCE OF 



LIFE," "OUTLINES OF ZOOLOGY," "AN INTRODUCTION TO SCIENCE"; 



JOINT-AUTHOR OF "THE EVOLUTION OF SEX " AND "EVOLUTION" 



I'M 



WILLIAM SMITH 



FOURTH IMPRESSION 



LONDON: ANDREW MELROSE LTD. 



3 YORK STREET, COVENT GARDEN, W.C. 



1915 



